Pion Photoproduction on Nucleons in a Covariant Hadron-exchange Model PDF Download
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Languages : en
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We present a relativistic dynamical model of pion photoproduction on the nucleon in the resonance region. It offers several advances over the existing approaches. The model is obtained by extending our [pi] N-scattering description to the electromagnetic channels. The resulting photopion amplitude is thus unitary in the [pi]N, [gamma]N channel space, Watson's theorem is exactly satisfied. At this stage we have included the pion, nucleon, [Delta](1232)-resonance degrees of freedom. The [rho] and [omega] meson exchanges are also included, but play a minor role in the considered energy domain (up to √s = 1.5 GeV). In this energy range the model provides a good description of all the important multipoles. We have allowed for only two free parameters--the photocouplings of the [Delta]-resonance. These couplings are adjusted to reproduce the strength of corresponding resonant-multipoles M{sub 1+} and E{sub 1+} at the resonance position. We then obtain R{sub EM} = 3.8 ± 1.6% for the E2/M1 ratio, in a qualitative agreement with other dynamical models.
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Languages : en
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Book Description
We present a relativistic dynamical model of pion photoproduction on the nucleon in the resonance region. It offers several advances over the existing approaches. The model is obtained by extending our [pi] N-scattering description to the electromagnetic channels. The resulting photopion amplitude is thus unitary in the [pi]N, [gamma]N channel space, Watson's theorem is exactly satisfied. At this stage we have included the pion, nucleon, [Delta](1232)-resonance degrees of freedom. The [rho] and [omega] meson exchanges are also included, but play a minor role in the considered energy domain (up to √s = 1.5 GeV). In this energy range the model provides a good description of all the important multipoles. We have allowed for only two free parameters--the photocouplings of the [Delta]-resonance. These couplings are adjusted to reproduce the strength of corresponding resonant-multipoles M{sub 1+} and E{sub 1+} at the resonance position. We then obtain R{sub EM} = 3.8 ± 1.6% for the E2/M1 ratio, in a qualitative agreement with other dynamical models.
Author: A. A. Komar
Publisher: Nova Publishers
ISBN: 9780941743778
Category : Science
Languages : en
Pages : 372
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Book Description
Studies the theoretical and experimental aspects of photoproduction of pions on nucleons and nuclei in the range of photon energies up to 1 GeV. Theoretical predictions are presented based on dispersion relationships of multiple pion photoproduction amplitudes. The problem of a complete experiment i
Author: Anton Nagl
Publisher: Springer
ISBN: 3540460667
Category : Science
Languages : en
Pages : 182
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Book Description
Photoproduction of pions from complex nuclei has become an investigative tool for (1) the detailed form of the elementary photopion amplitude, (2) the pion-nucleus optical potential, (3) nuclear structure, and (4) off-shell and medium effects on the elementary amplitude in nuclear processes. In this book, all these aspects are considered in detail. With improved experimental accuracy and beam tech- nology the study of nuclear pion photoproduction will break new ground and become an even more powerful investigative tool. This monograph is intended as an introductory guide as well as a reference manual for grad- uate students and researchers working in this important area of physics.
Author: B. Blankleider
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Author: Huey Wen Huang
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 182
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Author: Brian H. Bransden
Publisher: Princeton University Press
ISBN: 1400867444
Category : Technology & Engineering
Languages : en
Pages : 548
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Book Description
Synthesizing the theoretical and experimental advances in pion-nucleon interactions over approximately the last twelve years, the authors offer here a timely account of the hadronic interactions of pions and nucleons and of the structure of nucleons. Because of the hadronic SU3 symmetry, the book also treats the structure of baryons in general, and so contains much material external to the specific field of pion-nucleon interactions. Thus the book's subject can be stated as the hadronic structure of baryons as illustrated particularly by pion-nucleon interaction. Following an introductory discussion of isotopic spin, the authors proceed to chapters that treat low energy pion scattering by nucleons and the photoproduction of pions; forward and fixed momentum transfer dispersion relations; analytic properties of scattering amplitudes; formation of nucleon resonances; symmetries and classification of particles and resonances; current algebra, sum rules, and superconvergence relations; scattering at higher energies; pion-nucleon dynamics; pion-nucleon inelastic scattering; and the form factors of the nucleon and the pion. Each chapter is followed by abundant references to the original literature. The level of the writing is suitable for students at the graduate level, and the presentation is even and self-contained. On balance, the authors have prepared a useful consolidation and review of this difficult and changing area of investigation. Originally published in 1973. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Author: Yohanes Surya
Publisher:
ISBN:
Category : Pion production
Languages : en
Pages : 300
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Category : Power resources
Languages : en
Pages : 366
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Category : Aeronautics
Languages : en
Pages : 1330
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Author: G. von Holtey
Publisher:
ISBN:
Category :
Languages : en
Pages :
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